1) Latching on: The lips open outward and latch on the areola. A newborn baby has a sucking fossa that is small round cavity in the center of the upper jaw.
2) Peristaltic tongue movement (sucking): Wave-like tongue movement squeezes the nipple and extracts milk
3) Swallowing: The back of the tongue rises, channeling the milk into the esophagus.
Inner vertical lines strengthen the structure of nipples; making it collapse-resistant.
Textured surface allows baby to latch on easily and securely
100% silicone nipple; super soft and flexible, allows natural and smooth tongue movement